diff --git a/app/Jobs/LoadPostmarkHistory.php b/app/Jobs/LoadPostmarkHistory.php
index 5708e10e2b9e..0de75ad432a3 100644
--- a/app/Jobs/LoadPostmarkHistory.php
+++ b/app/Jobs/LoadPostmarkHistory.php
@@ -84,5 +84,7 @@ class LoadPostmarkHistory extends Job
 
             $str .= '<p/>';
         }
+
+        return $str;
     }
 }